<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello World</title>
</head>
<body>
<script type="text/javascript">
    alert("Hello World");
    confirm("您真的要关闭此网页么？");
    prompt("请输入您的会员卡号");
    document.write("大家好<br>我是谷哥的小弟");
</script>
</body>
</html>